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Writing Words in Numbers

A positive in...

Question

A positive integer is subtracted from its square. Which of the following could be the units digit of the final result?

A

3

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B

4

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C

5

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D

6

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E

7

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Solution

The correct option is E $6$
It is said that a positive integer is substracted from its square,
Lets plug in some values to check the answer
$1^{2} - 1 = 1$
$2^{2} - 2 = 2$
$3^{2} - 3 = 6$
$4^{2} - 4 = 12$
$6$ will be the answer from the given options.

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